JPH06290949A - Coil device, transformer, and electric device - Google Patents

Abstract

PURPOSE:To provide a coil device, a transformer, and an electric device which can be lessened in material cost and number of manufacturing processes. CONSTITUTION:A first winding wire 2 is wound outward at a constant interval in spiral around a hole 4 starting near the hole 4. A second winding wire 3 is also wound outward at a constant interval in spiral around the hole 4 starting near the hole 4. The second winding wire 3 is so wound as to be located at a center position between the winding turns of the first winding wire 2 and 1/10 or so as wide as the first winding wire 2, 5 and 6 denote the electrodes of the first and the second winding wires, 2 and 3, on a hole 4 side respectively. 7 and 8 denote the other end electrodes of the first and the second winding wires, 2 and 3, respectively. The first and the second winding wire are formed on both sides of a board 1, and the electrodes of the wire s 2 and 3 on a hole side on both sides of the board 1 are electrically connected together respectively through the immediately of a through-hole. By this setup, as the first and the second winding wire, 2 and 3, are formed in spiral on the same board 1, coils can be provided onto the board 1 in a comparatively small region.

Description

Detailed Description of the Invention

The present invention relates to a coil device, a transformer and an electric device using a plane coil.

[0002]

[Industrial applications]

[0003]

2. Description of the Related Art Conventionally, as a plane coil, an insulating substrate formed in a flat plate shape, a winding having a plurality of flat turns formed on the surface of the substrate, and a central end portion of the winding and a conductor portion are provided. There is known a coil device including a winding having an electrode portion provided on each end of the outer circumference. A printing method is known as a method for forming the winding on the substrate surface.

This conventional coil device is, as described above,
A single winding is formed on a flat plate, and it was mainly used as an inductance component in the circuit.

[0005]

However, when it is desired to use the coil device as a transformer instead of the inductance component, it is conceivable to construct the transformer by using two coil devices. In this case, the insulating substrate is used. Are required according to the number of coils, which causes problems of increase in material cost and manufacturing process.

The present invention has been made to solve the above problems, and an object thereof is to provide a coil device, a transformer and an electric device which can reduce the material cost and the manufacturing process.

[0007]

According to another aspect of the coil device of the present invention, an insulating substrate formed in a flat plate shape, a first winding formed in a plurality of flat turns on the substrate surface, and the first winding are formed. A first coil having first electrode portions provided on the end portion side of the center of the wire and on the end portion side of the outer periphery of the first conductor portion, and a substrate surface provided with the first winding. A second winding having a plurality of turns formed in a plane at approximately equal intervals to the respective portions of the first winding, a central end side of the second winding, and an outer periphery of the second winding. And a second coil having a second electrode portion provided on each end side of the.

A coil device according to a second aspect is the coil device according to the first aspect, wherein the width of the first winding portion is wider than the width of the second winding portion.

A coil device according to a third aspect is the coil device according to the second aspect, in which the interval between the first winding portion in the same turn and the second winding portion in the same turn is the first winding portion in the next turn. It is characterized in that it is substantially the same as the interval between and.

The transformer of claim 4 is the transformer of claims 1 to 3.
A coil device according to any one of the above, and a first of the coil device.
And a core arranged in the vicinity of the second winding, and.

An electric device according to a fifth aspect is the electric device according to the first to third aspects.
The present invention is characterized by including any one of the coil devices described above and a housing that houses the coil device.

An electric device according to a sixth aspect is characterized by comprising the transformer according to the fourth aspect and a casing for accommodating the transformer.

In the invention of claims 1 to 6, other electric elements may be arranged on the substrate, and the first and second electric elements may be arranged.
Other windings may be arranged.

[0014]

According to the coil device of the present invention, since the first and second windings are formed in a double spiral shape on the same substrate, the plurality of coils are relatively small on the substrate. It can be formed within a range of area.

According to the second aspect of the invention, when the currents flowing through the windings are different, the widths of the first and second winding conductors are changed, so that the values of the currents flowing through the respective windings are changed. The required minimum conductor width can be obtained. Therefore,
When the required minimum insulation distance is set, the range of winding formation can be reduced by the amount of the narrowed conductor width.

According to the invention of claim 3, the second winding is further formed substantially in the middle of each turn of the first winding. Therefore, when the minimum insulation distance is required, the range of winding formation can be increased. Can be minimized.

Further, in the invention of claim 4, the first and second aspects are provided.
Since the windings can be configured so that the winding parts are close to each other,
Good electrical coupling.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment common to claims 1 to 5 will be described with reference to FIGS.

First, the coil device 10 will be described.

Reference numeral 1 is an insulating substrate made of glass epoxy. A square hole 4 is formed in the center of the substrate 1.

Reference numerals 2 and 3 are first and second spiral windings in which a copper thin film is printed on the substrate 1.

The first winding 2 is wound around the hole 4 at the beginning of winding, and is spirally formed around the hole 4 in the outward direction from the hole 4. The second winding 3 also has holes 4 at the beginning of winding.
They are formed in the vicinity of the hole 4 and are spirally formed around the hole 4 at equal intervals in an outward direction from the hole 4. The second winding 3 is formed at a center position of the winding turns of the first winding 2, and the line width of the second winding 3 is about 1/10 of the line width of the first winding 2. .

Reference numerals 5 and 6 are electrodes on the hole 4 side of the first and second windings 2 and 3. Further, 7 and 8 are electrodes at the other ends of the first and second windings 2 and 3. The first and second windings are formed on both sides of the substrate 1, and the electrodes 2 on the side of the hole 4 on each side and 3 are electrically connected to each other through a through hole. . The winding directions of the first and second windings 2 and 3 on the front surface of the substrate 1 and the winding directions of the first and second windings 2 and 3 on the back surface are the same. That is, when the substrate 1 is seen through, the front and back windings are wound in the same direction.

Glass epoxy coatings 17, 17 are formed on the first and second windings 2, 3 formed on the substrate 1.

Next, the transformer will be described.

Coil device 1 formed as described above
2 pieces of 0 are prepared, and a substrate 1 having the same shape as the base 1 is further prepared.
A coil device 15 having only one winding 12, 12 having electrodes 16, 16, 17, 17 on both surfaces of 1 is prepared,
The coil device 15 is scissored between the coil devices 10, and a part of the illustrated E-shaped and I-shaped cores 21 and 22 is inserted into the hole 4 to form the transformer 20.

The poles 16 and 16 of the coil device 15 are electrically connected to each other through a through hole. Further, when the substrate 11 is seen through as in the case of the substrate 1, the front and back windings 12, 12 are wound in the same direction.

Next, the electric device will be described. FIG. 4 shows a load control device 30 as an electric device. Reference numeral 31 is a DC power source, 32 is, for example, a heater as a load, 20 is a transformer, 33 is a FET as a conduction control element, and 34 is a
Is a rectifier circuit composed of a diode 35 and a capacitor 36,
Reference numeral 37 is a control circuit for adjusting conduction control of the FET 33.

Since the control circuit 37 only outputs a signal for adjusting conduction control of the FET 33 by using the rectifying circuit 34 as a power source, the winding connected to the rectifying circuit 34 is the first winding which is the main winding. A thinner second winding 3 is sufficient as compared with the wire 2. Since the respective portions of the first and second windings are close to each other, electrical coupling is good.

[0030]

According to the coil device of the present invention, since the first and second windings are formed in a double spiral shape on the same substrate, a plurality of coils are compared on the substrate. It can be formed within a relatively small area.

According to the second aspect of the invention, when the currents flowing through the windings are different, the widths of the first and second winding conductors are changed, so that the current values flowing through the respective windings are changed. The required minimum conductor width can be obtained. Therefore,
When the required minimum insulation distance is set, the range of winding formation can be reduced by the amount of the narrowed conductor width.

In the invention of claim 3, since the second winding is formed substantially in the middle between the turns of the first winding, when the insulation distance is set to the minimum required, the range of winding formation is reduced. Can be minimized.

Further, in the invention of claim 4, the first and second aspects are provided.
Since the windings can be configured so that the winding parts are close to each other,
Good electrical coupling.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of one embodiment of claims 1 to 6.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing a main part of one embodiment of claims 4 to 6;

FIG. 4 is an exploded perspective view showing a main part of one embodiment of claims 1 to 6.

FIG. 5 is a circuit diagram showing a main part of one embodiment of claims 1 to 6.

[Explanation of symbols]

1 ... Insulating substrate, 2 ... 1st winding, 3 ... 2nd winding, 5, 6, 7, 8 ... Electrode, 10 ... Coil device, 21, 22 ... ..Cores, 20 ... Transformers, 30 ... Electric devices

Claims (6)

[Claims] 1. An insulating substrate formed in a flat plate shape; a first winding having a plurality of flat turns formed on the surface of the substrate; and a central end portion of the first winding and a first conductor. A first coil having a first electrode portion provided on each end side of the outer circumference of the portion; and a portion of the first winding on the substrate surface on which the first winding is provided. A second winding formed in a plane with a plurality of turns at equal intervals, and a second winding provided on the central end side of the second winding and the outer peripheral end side of the second winding, respectively. A second coil having an electrode portion; and a coil device. 2. The coil device according to claim 1, wherein
A coil device, wherein the width of the winding portion is wider than the width of the second winding portion. 3. The coil device according to claim 2, wherein a distance between the first winding portion in the same turn and a second winding portion in the same turn is substantially the same as a distance between the first winding portion and the first winding portion in the next turn. The coil device according to claim 1. 4. A transformer comprising: the coil device according to any one of claims 1 to 3; and a core arranged in proximity to the first and second windings of the coil device. . 5. An electric device comprising: the coil device according to claim 1; and a housing for housing the coil device. 6. An electric device comprising: the transformer according to claim 4; and a housing that houses the transformer.